Edge Waypoint can not be grabed in Firefox Browser

[rsoika]

I currently have a strange effect with my modeller project. When running the modeler in Theia using Firefox Browser I can not grab a Edge Waypoint and move it.

But every thing else works normal. Using chrome browser all works fine.

You can see this effect in the online demo of coffee-editor too: https://try.theia-cloud.io/?appDef=coffee-editor

If you run the demo in Firefox and select a waypoint, you can not move it on the first click. You need to click the waypoint twice to get it moveable.
But when using Chrome the waypoint is always moveable.

Maybe I have implemented a selectionService in a wrong way causing this issue. But in my case I can not move a waypoint in Firefox even if I click several times on the waypoint.

Does anybody know about this kind of issue?

[martin-fleck-at]

@rsoika Good catch! I actually can reproduce this on the workflow example as well. However, from a first glance I did not see anything obvious missing. I will do a deeper dive tomorrow and let you know if I find the issue. Thank you for the report!

[rsoika]

...maybe this is somehow related to the fix of #657 ? But now it does not really depend on the count of routing points....

[martin-fleck-at]

I created #877 to track the issue and already proposed a fix in eclipse-glsp/glsp-client#224. It seems to me like Firefox is sending an additional mouseEnter event after the mouse down which caused us to reset the drag position. However, I don't think we need to reset the position at all on mouseEnter.